Well I got the ball screws today and can say they seem to be everything I was hoping for and more. Class5 precision ground ballscrews with antibacklash nuts and quality looks excellent.
Hope to get time this weekend to machine the ballscrews and may have to make new brackets to mount them as the nuts look to be a bigger dia than the ones that are on.
For anyone in the UK looking for ballscrews I recommend you get in contact with Martin at
http://www.motionandbearing.co.uk as I think their prices are hard to beat, I certainly couldnt find class 7 rolled ballscrews at these prices never mind precision ground class5.
Hood